It seems by the number of Youtube videos, ship anchors go bad quite often. It seems there is a drum braking mechanism that is prone to failure. I wonder if retired Royal Naval shipman known as Vest experienced anchor failure? Ship anchors have never been a fascination for me, but it is interesting to learn about what happens that ship passengers never see. After three minutes of extensive research on Youtube, this is the best I could find. I think the quite expensive chain has gone to Davy Jones' Locker.